The rate of change: ( y2 - y1 ) / (x2 - x1) = ( 18 in - 12 in ) / ( 6 ft - 4 ft ) = = 6 in / 2 ft = 3 in / 1 ft Answer: D ) 3 inches up per foot across
You would first turn it into an improper fraction, to do this you leave the denominator(bottom number) then times it by your variable and add the numerator(top number)
